The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2002
Filed:
May. 31, 2000
Satoshi Sato, Miyagi, JP;
Shinichi Matsumura, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic recording medium exhibiting satisfactory electromagnetic conversion characteristic and movement characteristics and incorporating a non-magnetic support member made of aromatic polyamide film. The magnetic recording medium incorporating a non-magnetic support member having a principal plane on which a magnetic layer constituted by at least a thin metal film is formed, wherein said non-magnetic support member has said principal plane on which at least said thin metal film is formed and on which small projections, the height of each of which is 10 nm to 40 nm from the central surface, are formed at a density of 1,000,000 pieces/mm to 20,000,000 pieces/mm , and a bearing curve of the principal plane of said non-magnetic support member on which said small projection have been formed is such that the gradient of a straight line is −0.3 or smaller when a range of 10 nm in the upper portion is linearly approximated with a straight line by a least square approximation and the intercept is 10 nm to 40 nm.